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arXiv 0901.1999math.PR
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关于时变黎曼度量的布朗运动及其在里奇流中的应用

Brownian motion with respect to time-changing Riemannian metrics, applications to Ricci flow

Koléhé Abdoulaye Coulibaly-Pasquier

摘要:

本文将黎曼流形上的布朗运动推广到一类依赖于时间的度量的情形。这样的问题是自然的方程,如热方程关于不定常拉普拉斯算子(非均匀扩散)。在本文中,我们特别感兴趣的里奇流,它提供了一个内在的家庭的不定常指标。我们给出了沿此布朗运动的平行输运的概念,并建立了Dohrn-Guerra或阻尼平行输运的推广,Bismut积分的部分公式,和梯度估计公式。我们的主要结果之一是表征的里奇流的阻尼平行运输。最后给出了随机流的阻尼平行迁移的一个内禀定义,并导出了一个内禀鞅,它可以提供流的奇异性信息。

英文摘要:

We generalize Brownian motion on a Riemannian manifold to the case of a family of metrics which depends on time. Such questions are natural for equations like the heat equation with respect to time dependent Laplacians (inhomogeneous diffusions). In this paper we are in particular interested in the Ricci flow which provides an intrinsic family of time dependent metrics. We give a notion of parallel transport along this Brownian motion, and establish a generalization of the Dohrn-Guerra or damped parallel transport, Bismut integration by part formulas, and gradient estimate formulas. One of our main results is a characterization of the Ricci flow in terms of the damped parallel transport. At the end of the paper we give an intrinsic definition of the damped parallel transport in terms of stochastic flows, and derive an intrinsic martingale which may provide information about singularities of the flow.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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